Providing Access to Application Data

Disclosed are various embodiments for providing access to application data stored by multiple applications across multiple devices of a user. A request to store application data is obtained by a data storage service from an application associated with a user. The application is executed in a client computing device, and the request specifies a security credential and is obtained by way of a network. The application data is stored by the data storage service in response to the request to store. The data storage service may be configured to store data for multiple applications associated with the user, and each of the applications may be associated with a different security credential.